1999373 has 4 divisors (see below), whose sum is σ = 2008188. Its totient is φ = 1990560.

The previous prime is 1999363. The next prime is 1999379. The reversal of 1999373 is 3739991.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 114244 + 1885129 = 338^2 + 1373^2 .

It is a cyclic number.

It is not a de Polignac number, because 1999373 - 2¹⁰ = 1998349 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1999373.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1999379) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4058 + ... + 4523.

It is an arithmetic number, because the mean of its divisors is an integer number (502047).

2^1999373 is an apocalyptic number.

It is an amenable number.

1999373 is a deficient number, since it is larger than the sum of its proper divisors (8815).

1999373 is an equidigital number, since it uses as much as digits as its factorization.

1999373 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8814.

The product of its digits is 45927, while the sum is 41.

The square root of 1999373 is about 1413.9918670205. The cubic root of 1999373 is about 125.9789374384.

The spelling of 1999373 in words is "one million, nine hundred ninety-nine thousand, three hundred seventy-three".